assignment of keys to a document

sorry are not keys is password

Hi,

Thanks for contacting us here about this extension.

I would like to know how is the assignment of keys to a document, the user must be registered or can I assign a specific key to the document to be able to download it?

Generate a password for files is not implemented yet. You can set permission for single users to download files presently.
For more information: https://www.joomunited.com/documentation/dropfiles-documentation#toc-4-3-acl-file-permission

Hope it helps!
Cheers,